Question

Fish can adjust their buoyancy with an organ called a swim bladder. The swim bladder is a flexible gas-filled sac; a fish can increase or decrease the amount of gas in its swim bladder so that it stays neutrally buoyant, neither sinking nor floating. Suppose a fish is neutrally buoyant at some depth and then goes deeper. What needs to happen to the volume of air in the swim bladder

Answer 1

Answer:

Volume needs to increase with increased depth

Explanation:

The pressure on the fish body will increase as the fish dives. This increased pressure will lower the volume of the air bladder roughly along the lines of

PV = nRT

To maintain neutral buoyancy, the bladder volume will have to be increased to displace the same amount of water as before.